SQL is a standard language for storing, manipulating and retrieving data in databases. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, …

Firstly, it introduced the concept of accessing many records with one single command. Secondly, it eliminates the need to specify how to reach a record, i.e., with or without an index.

This tutorial introduces you to the SQL comparison operators and shows you how to use them to form conditions for filtering data.

Nov 18, 2025 · Using <> in a simple query. The following example returns all rows in the Production.ProductCategory table that do not have value in ProductCategoryID that is equal to the …

Jun 9, 2023 · Learn about the different types of SQL comparison operators like =, >, <, and more and how these can be used to narrow down query results.

In SQL Server, you can use the <> or != operators to test for inequality in a query. For example, we could test for inequality using the <> operator, as follows: In this example, the SELECT statement …

Jul 23, 2025 · In this guide, we will see a comprehensive cheat sheet for essential SQL operations, offering a practical reference for tasks ranging from database creation to advanced data handling …

SQL, or Structured Query Language, is a language designed to allow both technical and non-technical users to query, manipulate, and transform data from a relational database. And due to its simplicity, …

Jan 2, 2026 · Structured Query Language (SQL) is the standard language for data manipulation in a DBMS. In in simple words its used to talk to the data in a DBMS. Following are types of SQL …

This tutorial provides you with easy to understand SQL instructions and allows you to practice while you are learning, using an online SQL interpreter. By practicing your SQL commands and seeing …